The Montgomery County Historical Society will host an open house at the home of Idabel Evans, 904 South Main St. in Hillsboro, on Sunday, Aug. 2, from 12 to 3 p.m. and Monday, Aug. 3, through Friday, Aug. 7, from 10 a.m. to 2 p.m. The Harkey House, 305 South Broad St. in Hillsboro, will be open Sunday, Aug. 2, from 12 to 3 p.m. and Thursday, Aug. 6, from 10 a.m. to 2 p.m.